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Kohler EFI Fuel Pump Power


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I have  2008 Cub Cadet Volunteer Tracker.  Was running fine, parked and next morning electric fuel pump inop.  Checked voltage had 4.2 volts.  Swapped relays in fuse box, checked all fuses (good) and still low voltage.   Does the ECU control the voltage to the fuel pump or which relay controls the voltage to the pump?

Have checked all wiring and not found any place it could be shorted (not saying I may have missed something). I am at a loss.  Need Help Please.

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